The GML Digital Noise Filter is a two-channel, all-digital system intended for the selective, real-time removal of low to medium-level noise artifacts. Developed jointly with the Walt Disney Company, the GML 9550 was originally designed for motion-picture post-production, particularly the removal of noise from archival sources. Since then, it has found applications in many other areas of post-production, as well as in the restoration of deteriorated sources in music production and location sound.

In the desktop controller, eight straight-line controls adjust the thresholds for 64 linearly-distributed frequency bands. Eight two-color LEDs indicate whether, and the degree to which, each group of bands is being gated and processed.

In the Macintosh front-end controller, all 64 bands are individually adjustable, and the user may selectively view either the signal level after the FFT or the instantaneousreduction for each band.

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